Systolic Arrays. Presentation at UCF by Jason HandUber February 12, 2003
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1 Systolic Arrays Presentation at UCF by Jason HandUber February 12, 2003
2 Presentation Overview Introduction Abstract Intro to Systolic Arrays Importance of Systolic Arrays Necessary Review VLSI, definitions, matrix multiplication Systolic Arrays Hardware & Network Interconnections Matrix-Vector Multiplication Beyond M.V. Multiplication Applications and Extensions of covered topics Summary
3 Introduction - Scenario Your boss approaches you at work and notifies you that the company has a chance at landing an obscenely lucrative government contract. He asks you to put together a proposal and indicates that for you to keep making the $130,000 / year that you make you should be able to secure the contract. Lastly, he informs you that the government contract is concerned with one of the topics on the following slide, that you have essentially limitless funding, and that the contract specifies that the final run-time of the algorithm must be linear.
4
5 Introduction Why? What is the main commercial point of Computer Architecture? Essentially Moore s Law To that end, what are two main points computer architects have been focusing on in recent years? Pipelining & Parallelism
6 Moore s Law
7 Introduction Pipelining & Parallelism Processor Pipelining Parallelism Ideally at least one new instruction completes every time cycle. Multiple jobs are allowed to perform simultaneously
8 Introduction Systolic
9 Introduction Systolic Definition Imagine n simple processors arranged in a row or an array and connected in such a manner that each processor may exchange information with only its neighbors to the right and left. The processors at either end of the row are used for input and output. Such a machine constitutes the simplest example of a systolic array. [1]
10 Introduction Systolic Definition (2) Systolic Arrays are regular arrays of simple finite state machines, where each finite state machine in the array is identical A systolic algorithm relies on data from different directions arriving at cells in the array at regular intervals and being combined. [2]
11 Systolic Arrays By pipelining, processing may proceed concurrently with input and output, and consequently overall execution time is minimized. Pipelining plus multiprocessing at each stage of a pipeline should lead to the best-possible performance. [3]
12 Introduction Review - VLSI VLSI Very Large Scale Integration VLSI is low-cost, high-density, high- speed. VLSI technology is especially suitable for designs which are regular, repeatable, and with high localized communications. A systolic array is a design style for VLSI. [3]
13 Introduction Review - Matrix Multiplication Consider multiplying a 3x2 X 2x1 matrix:
14 Introduction Review Systolic Cell basic workhorse (processor) of a systolic array. Few Fast Registers ALU Simple I/O Multiple CPUs on one machine Parallel Execution
15 Systolic Advantages How they work A systolic array has multiple cells networked together to form an array. Speed register to register transfer of data. Data is not destroyed until it has been completely used. Synchronization All cells run off of a central clock. Host Data Entry All cells (including boundary cells) are I/O capable.
16 Example of Linear Systolic Array Breakdown of data into 3 parts Input matrix 1 Input Matrix 2 Output matrix What are the different parts to an array? What is bandwidth?
17 Systolic Arrays
18 Y values goes left, X values go right, A values fan in T0 T1 T2 T3 T4 T5 T6 T7
19 PIPELINING Systolic Arrays Linear Systolic Arrays Multiple CPUs Pipelined Together Basic Architecture Speed Up O(wn) Exponential 2n + w Linear!!
20 Systolic Arrays The concepts used in Matrix-Vector multiplication can be easily extended to compute more complex functions. Some of these functions were introduced in the introduction during the flash presentation and include the multiplication of multiple matrices and n-dimensional applications.
21 Systolic Arrays
22 Pipelining Vs. Systolic Array Input data is not consumed Input data streams can flow in different directions Modules may be organized in a two dimensional (or higher) configuration Configurable Different array configurations available for different processing purposes.
23 Systolic Advantages and How they work. Systolic Array A network of systolic Cells. Systolic Cell An independent operating environment with processor, registers and ALU. Scalable Easily extend the architecture to many more processors. Capable of supporting SIMD organizations for vector operations and MIMD for non- homogeneous parallelism. Allow extremely high throughput w/multi- dimensional arrays.
24 Systolic Disadvantages Complicated Both in Hardware and Software. In fact entire volumes exist outlining systolic array verification. Expensive in comparison to uni- processor systems, although much faster.
25 Presentation Summary Systolic Arrays offer a way to take certain exponential algorithms and use hardware to make them linear. They are expensive and complex but yield enormous throughput. Any Questions?
26 References [1] Bayoumi, Magdy.. Ling, Nam. Specification and Verification of Systolic Arrays. World Scientific Publishing Co. Pte.. Ltd. Singapore [2] Brown, Andrew. VLSI Circuits and Systems in Silicon. McGraw-Hill Book Company. London [3] Dewdney, A.K. The (New) Turing Omnibus. Henry Holt and Company. New York [4] Fisher, J. Very long instruction word architectures and the ELI-512. In proc. 10 th International Symposium on Computer Architecture. June 1983, pp [5] Hennessey, J. Patterson, D. Computer Architecture: A Quantitative Approach. Morgan Kaufmann Publishers. San Francisco. [6] Kung, H.T. Leiserson,, C.E. Algorithms for VLSI processor arrays. C. Mead and L. Conway, editors, Introduction to VLSI Systems, Ch Addison-Wesley [7] McCanny,, John. McWhirter,, John. Swartzlander,, Earl. Systolic Arrays Processors. Prentice Hall International Ltd. Hertfordshire [8] Moore, Will. McCabe, Andrew. Urquhart, Roddy.. Systolic Arrays. J W Arrowsmith Ltd. Bristol
27 Post-Presentation Thoughts The comment made in class that it is difficult for the programmer to know when to implement parallelism isn t really a fair statement. Certain newer architectures and compilers determine all code dependencies and make it easy for a CPU scheduler to efficiently divide such tasks with help from the code itself during compile-time. For more information on some of these newer architectures look up VLIW (Very Long Instruction Words) to see how smart compilers in conjunction with specific schedulers can package instruction words so that they easily take full advantage of multiple processors with minimal or no delay to compute the division of such tasks.
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